**alert("Hello World")**** :**
You can’t interact with the webpage at all until you hit OK and dismiss the alert.
WeakMap allows you to add additional data into an Object that belongs to another or third-party code. With the special “weak” link feature of WeakMaps, we can make sure the data associated with this alien object, would only exist as long as the object is alive.
Import and export statements are two great features introduced ES6 (ES2015). These two statement allows you to export and import your code and use it whenever you need. This tutorial will show you what import and export statements are, how they work and how to use them.